Which Purkinje image results solely from reflection?

The correct answer is the first Purkinje-Sanson image (PS 1), which results solely from reflection. Understanding Purkinje images is crucial in the field of optics and visual perception, as these images are reflections of objects coming from the anterior and posterior surfaces of the cornea and lens.

PS 1 specifically refers to the image formed by light reflecting off the front surface of the cornea. Since this image is derived solely from the reflective properties of the corneal surface, it does not involve any refraction. In contrast, the other Purkinje images (PS 2, PS 3, and PS 4) involve additional factors such as the refractive properties of the lens and other internal structures of the eye, which complicate their formation. Each of these other images stems from either multiple reflections or both reflection and refraction, thereby distinguishing them from PS 1.

Thus, PS 1 serves as a fundamental reflection image, making it the correct answer in this context.